Re: I.2 - Grouping

[Paul Mackerras]

stephane eranian writes:

> What happens if I do:
>    fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
>    fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
> 
> And then:
>    fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1, 0);

That perf_counter_open call will fail with an EINVAL error because fd1
is not a group leader.

Paul.
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